It’s interesting how difficult it is to genuinely not care about what other people think about your decisions. On a certain level, that’s a very good thing. We don’t want to turn into heartless, self-centered, blocks of ice.
However, we should understand what we want to do and why we want to do it and tune out the rest. At least, as much as we’re able.
Simply put, you will achieve nothing of worth in life if you are primarily concerned with the opinions of others.
Be kind, be empathetic, but ruthlessly stick to your path and plan. Fail based on your ideas, not trying to impress everyone else. You'll be much more fulfilled and happy.